Method of making a brake member



Feb. 28, 1933. G, J THOMAS 1,899,599

METHOD OF MAKING A BRAKE MEMBER Filed May 31, 1928 3 Sheets-Sheet 1 INVENTOI? E Georged Thoma/ A TTOR/VEY Feb. 28. 1933. G J THOMAS 1,899,599

METHOD OF MAKING A BRAKE MEMBER Filed May 31, 1928 3 Sheets-Sheet 2 INVENTOR Georged." Thoma? A TTORNEY Feb. 29, 1933. G, J THOMA 1,899,599

METHOD OF MAKING A BRAKE MEMBER Filed May 51, 1928 3 Sheets-Sheet 5 I N V EN TOR. 550/?55 J THU/VH5 ATTORNEYS.

, 1 which:

Patented Feb. 28, 1933 GEORGE .T. THOMAS; OF OUTH nnunfinnmlm, ASSIGNOR 'I O EBENDIX- BR E-icon rnny, or sou'rngnnun, 'rnn ana, A conponn'r ou on ILLINoIs-g METHOD QEMAKING A-YIBRAKE MEMBER g Application filecl jMay :31

This invention relates tobralies and is il-i lustrated as embodied in an internal expand; mg automobile brake of the two shoe-'seli energizing type. Anobjectof the invention =1 is to simplifythe manufacture of brake shoes by a'novel methodof forming'the same from straight lengths of standard T-shaped rolled or drawn steel stock, it being well known that structuralv steel which is rolled or drawn cost and with a high degree of accuracy.

A further "object relates to the particular,-

design of the shoe'formedas-indicated above; wherein astiffening web extends between the edges :of a cylindrical orl rim part protrudg ing at the shoe ends 'beyondsaid. rim part and constituted at one end to ,form a novel cam-engaging surface. Q; by

' Other desirable features of novelty include a novelarticulated connection for two juxtaposed shoes, and a novel fixedpivot or anchor connection comprising a novel combination of anchoripin and bushing co-operating with the associated shoe and brake housing parts. In ;one illustrated arrangement embody: ing'the feature of novelty, I provide abrake of the servo type including shoes constructed accordingjto my invention, i. e. :of 'T stock suitably shaped-from a straight length into the curved finished article. In the arrange ment disclosed,,the'shoes are connected by my novel articulated oint preferably formed passing a three diametered screwnnachine part through corresponding openingsin the ends of thfe'shoes furthermore; at least one of the shoes.is'preferably anchored to the brake housing by my novel pin and bushing connection comprising 1 a headed bushing passing through the pivot armof the shoe in combination; with ,a novelfstud passing throughthe bushing, botlrbushing and stud secured to the arm by suitable nuts or staking or peening operation. The above and other objectsand features 1 of the invention, including variouscombinations of parts and desirable particularconstructions, will be apparent from-thefollow ing description of illustrative embodiments shown in the accompanying drawings, in

in a standard shape is producedat verylow- 928-;: .?ia -5 .661: J

tigers; at an elevation era-1 ma i expanding brake of the self-energizing; type e nstrrmmd aceo din'gtomy inv ntion F gure 2 we part alelevat on', lookingl'm the direction of the arroWsQ-F-Z of Figure l, Q

showing the articulated shoe connectioi1i '1 p F1gure-3'1sjay ew similar to 'Figure.?, lookin the direction of :the arrows 3 -3161 7 i ciated parts; V g 11 mm 41$ a a menta yvwwm anchor taken onfl ".e

Eigure h'showing thenovel anchor and ass);

a "Se n thr lgh, t MofFigurelg" H V Figure 5.-is a sectional View .ofthe art-ion lated joint taken on line 5- -5 of sti ma is a partiap Y' 'ewin t'ihfs t e ek n e een' Qfith ra e h a. .FiguiieTis a section talzen through one the shoes disclosing the foifrnation of the Figure 8. discloses} 's'ectiointhrougha mod ifiedforinof bushin d shoe cofmection;

L K ,d 12 illustrative of steps in the preferred niethodfof manuigure's 9 7 1 an fe' i ethes o a. I? 1 1 A preferred anbodiment" ofthe invention as illustrated in the drawings comprisesgprinary. ands'econdaryshoe IQ and'l2 constitilting a so-called ps'er o congbination'; con nected at 14" by} myi no've'l "pivot structure $9 and preferably'anchored to: the conventional backin plate 1 by a novel: cbnpe uoa- 1s. cam. 2 "m y e rwi h sk i n a r rat en. ife s the pr ma y, S1108310 fl -e ment hel'braked 2 ,i hieh shoe turn. forces secondary shoe "12"into fdrurhfenga'g'ement' Return springs 10 'ifimction' to return the shoes to an inactive peeitionf Preferably thepo sition of the joint14 with respect to the 'fix'e'dpivotfor anchor-18 9 and desi-gnat'ed'by an angle .Y should not be v 18 endrr vl n ti e-twe the st results with brakeshoeslin af selfi re Z eerr hs nt e A particularly salient feature of Q 'ventioninvolves the manner ofic onstructing the shoes. lyfind it quite feasible and'zpra'cjtical to shape the shoe in a suitable machine from a. section of standard. T" shaped rolled 1 dr wn steel. as ,shbua i -Fi e9 1 =39" known in the metallurgical art and are of but leavethesame straight'. In my second peculiar value in a brake shoe;

With particular reference to the method'of formingthe primaryshoe, I pRefeI"fi1St,tO

cut a suitablelength of the T stock-such as 60, secondly to cut away the rim portion thereof at its ends as at 62",:leaving protruding web portions 64 and as a third and last operation form, on a suitable stampingpress or by equivalent means, the shoe into substantially semi-circular form. In this lastoperation it is to beparticularly noted however that I do not curve one end 66 0f the shoe operation, I furthermore taper, by cutting or otherwise .as at 67, the straight end offthe shoe just mentioned as 'is clearly indicated in Figure 1 and Figures lland 12 and slight.- ly ofiset as at 69 the projecting web portion at the other end as at 68. The aforesaid operations roduce the primary shoe 10 of Fig ure 1 em odying, as described, a novel cam engaging end part 28 The secondary shoe or any brake shoe other than 'theprimary shoe may be similarly for-med, that is by cutting a suitable section from straight length T stock and subsequently bending thessame to shape; The

, L rim may or may not be out enough to expose the web at the ends .as desired.

As illustrated in Figures 1 and 6,said camengaging. part. constitutes in effect a tapered stem 24 and the" other end likewise forms a stem 30. Stem part 24 is preferably recessed to: house. a Cylindrically shaped hardened steel .insert. 2 8. and stem 30 mayb slightlyfcfiset and provided with an openng to. accommodate my novel articulating element to be 1 described hereaften a Y It is obvious, of course, that hardened mater1al,.such {as manganese steel maybe deposited ,on the:end offt'he stem. 2411s by an electric'welding pro-cess,rso ,that'I do not wish tobe limited toanyspecific mannerofappIymg. cam-engaging thrust memb'en" An important phaseof my invention has to. dowith a novel anchor structure for the shoes in which stem .34 of shoe -12, isiniila'r in all resfpectsto stem30 of shoe 10', is pref- ,erably5provided witha novel'bushing36 passng \thr'ougha hole'in the end .bfthe stem and hav ng a shrink fit therewith. Bushing 36, of suitable bearing metal, is preferably beaded at 38 to contactwith ionesideofthe stem andmay be locked in position by a'nut 4Q threaded or otherwise attached to the bushing and contacting :with the otherside of the stem. An anchor pin 42.n1ay be passed thrqugh the bushing and attached thereto by a sultable'nut 43 abutting against the end Of the'same and backing plate 16, being secured to the latterby nut 45;

The modified arrangementof bushing attachment as disclosed in Figure 8 is similar to that disclosed in Figure-4 with the excepr.

tion that the end 46 of the same-ispreferably peened or staked over at its end to abut againstthestem .34.'--: This arrangement obviates the nut 40 of Figure 4 and provides a more rigid structure;- Tomake possible an assembly of this arrangement, maximum diameter'cd of the staked portion is made as muchgreater than diameter, (1-?) as it is possible to use and still force the shoe stem 34' over the shoulder formed by 0d under proper shrinktemperature conditions.

A further'feature relates to my novel pivotal joint 14 clearly disclosed inFigures 1 and 5. In this arrangement I preferably connect ofl-set stems 30' and 34 of shoes 10 and 12 respectively by a three diameteredscrew machine part 48 adapted to pass through eorrespondinglyshaped holes insaid stems. The

part 49 may be the largest in diameter and maybe provided withv two. flats 49 formed thereon for the purpose of "receiving a wrench. Part 50 is smaller in diameter than part 49 and may be slightly wider than the stem 30 of shoeilO through which it passes. Third part 52 passing through stems34 is narrower than the thicknessof the stem so that when the locking nut154 is drawn up to secure the parts-together, the stem 34' will be drawn against the part 50 to provide my novel articulated joint. It is obvious that by the arrangement disclosed stems 30 and 34 are pivoted and freely movable one with another. 1

From what has been said it will be seen that the brake shoes herein disclosed may be made in such a wayandfrom suchmaterials as will provide a very rigid brakdaided and abetted by my novel fixed'and movable pivot structures as described and disclosed;

While certain illustrative embodiments of my invention have been described in detail, it is not my intention to limitits scope to those particularembodimentsior otherwise than by the terms and scope of-the appended-claim.

Most of the subject matter herein claimed is to be regarded as continued from my prior application No. 747 707,, filed-November 4, 1924." v

I claim:

The herein described method of making a the section to leave projecting web-ends,

tapering one projecting web end to form a cam follower, and bending said section into a substantially semi-circular shape at all points except at said cam follower, the underside of the Web at said end remaining straight.

In testimony whereof, I have hereunto signed my name.

GEORGE J. THOMAS. 

